County profile · official public datasets

Chittenden County, VT

184 public highway bridges tracked in the FHWA National Bridge Inventory: 54.9% rated Good, 42.9% Fair, 2.2% Poor.

184
Public bridges
54.9%
Good condition
2.2%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Chittenden County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 43%
lowest Poor share in state
2.2%
Poor-condition share
184
public highway bridges
1967
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Chittenden County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Chittenden County ranks #6 of 14 Vermont counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.2%). Chittenden County, Vermont contains 184 public highway bridges. Roughly 54.9% are rated “Good,” 42.9% “Fair,” and 2.2% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

184

Public highway bridges in Chittenden County

Good condition

54.9%

101 of 184 rated 7-9

Fair condition

42.9%

79 of 184 rated 5-6

Poor condition

2.2%

4 of 184 rated 4 or below

In-state Poor-share rank

#6 of 14

Among Vermont counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 184 NBI-tracked bridges by lowest applicable component rating.

Good
54.9% (101)
Fair
42.9% (79)
Poor
2.2% (4)

Chittenden County's Poor-condition bridges carry 26,410 vehicle crossings a day

That is 1.1% of the county's reported daily bridge traffic on 2.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 6,603 crossings a day against 11,004 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 184 of 184 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

64.7% of Chittenden County's bridges have passed the 50-year mark

119 of the 184 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 54.9% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 67.4% of the county's Poor-condition bridge traffic

US 00002 ML over I 89 UNDER US 2, built 1964, carries 17,800 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 4-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 26,410 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Chittenden County's bridges were built

184 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1960s, when 66 of the county's bridges still in the inventory were built, which is 35.9% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1967) matches the Vermont average (1964).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Chittenden County compares with Vermont's closest counties by inventory size

The 5 Vermont counties nearest Chittenden County in number of bridges, with their condition splits. Its 2.2% Poor share is the 4th-lowest of these 6. Its average build year of 1967 against a peer-group mean of 1964 is in line with the group.

Showing the 5 closest of 13 Vermont counties eligible for comparison.

Bridge inventory size and condition shares for Chittenden County and the 5 Vermont counties closest to it in inventory size
County Bridges Poor
Bennington County 215 0.9%
Orange County 208 1.9%
Chittenden County (this page) 184 2.2%
Orleans County 181 2.8%
Franklin County 149 0%
Addison County 143 2.8%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Chittenden County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Chittenden County, both outside Vermont so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside VT (184 bridges here).

Similar average build year

Nearest mean year-built outside VT (1967 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 184 Good 101 Fair 79 Poor 4

Good-condition bridges (101)

C3036

Good

Over: STEVENSVILLE BROOK

0.01 MI N JCT W TH37, Chittenden, VT

Built 1998 Load: 42.6 t ADT: 50

C3022

Good

Over: BRUSH BROOK

0.7 MI TO JCT W CL3 TH21, Chittenden, VT

Built 2023 Load: 43.5 t ADT: 15

C3021

Good

Over: BRUSH BROOK

0.01 MI TO JCT W C3 TH22, Chittenden, VT

Built 2004 Load: 43.5 t ADT: 20

C3029

Good

Over: MILL BROOK

0.13 MI TO JCT W CL2 TH3, Chittenden, VT

Built 1995 Load: 43.5 t ADT: 160

US 00007 ML

Good

Over: LAPLATTE RIVER

4.4 MI S JCT. I189, Chittenden, VT

Built 2001 Load: 43.5 t ADT: 17,100

TH 95 (ESSEX WAY)

Good

Over: TH 95 OVER VT 289

0.6 MI S JCT. VT 15, Chittenden, VT

Built 1993 Load: 43.5 t ADT: 670

C3035

Good

Over: MILL BROOK

0.04 MI TO JCT W CL2 TH1, Chittenden, VT

Built 2002 Load: 44.5 t ADT: 40

C3006

Good

Over: MUDDY BROOK

1.1 MI TO JCT W VT2A, Chittenden, VT

Built 1996 Load: 44.5 t ADT: 770

I 00089 ML

Good

Over: I 89 OVER US2&JOINER BK

6.8 MI N EXIT 10, Chittenden, VT

Built 1961 Load: 44.5 t ADT: 28,200

I 00089 ML

Good

Over: I 89 OVER US2&JOINER BK

6.8 MI N EXIT 10, Chittenden, VT

Built 1961 Load: 44.5 t ADT: 28,200

US 00007 ML

Good

Over: LAMOILLE RIVER

5.7 MI N JCT. U.S.2 W, Chittenden, VT

Built 1998 Load: 45.4 t ADT: 8,700

VT 00117 ML

Good

Over: ALDER BROOK

2.4 MI E JCT VT15&2A, Chittenden, VT

Built 2021 Load: 45.4 t ADT: 9,400

C3003

Good

Over: HUNTINGTON RIVER

0.1 MI E TO JCT TH1, Chittenden, VT

Built 2000 Load: 46.3 t ADT: 520

C2003

Good

Over: WINOOSKI RIVER

0.02 MI TO JCT W US2, Chittenden, VT

Built 2002 Load: 47.2 t ADT: 1,500

C2002

Good

Over: LEE RIVER

0.15 MI TO JCT W CL2 TH1, Chittenden, VT

Built 1941 Load: 48.1 t ADT: 420

TR 01 FAS 211

Good

Over: COBB BROOK

4.4 MI N JCT. VT.17, Chittenden, VT

Built 1976 Load: 48.1 t ADT: 780

C3037

Good

Over: BROWNS RIVER

0.01 MI E JCT W TH1, Chittenden, VT

Built 1998 Load: 49.0 t ADT: 80

I 00089 ML

Good

Over: MALLETTS CREEK

1.3 MI S EXIT 17, Chittenden, VT

Built 1964 Load: 49.0 t ADT: 32,600

TR 01 FAS 211

Good

Over: HUNTINGTON RIVER

5.0 MI S JCT. U.S.2, Chittenden, VT

Built 2001 Load: 49.0 t ADT: 2,100

C3004

Good

Over: HUNTINGTON RIVER

0.2 MI TO JCT W CL2 TH1, Chittenden, VT

Built 2007 Load: 49.9 t ADT: 890

US 00007 ML

Good

Over: US 7 OVER I 189

I189 EXIT 1, Chittenden, VT

Built 1988 Load: 49.9 t ADT: 39,000

I 00189 SPUR

Good

Over: I 189 WB OVER I 89

I 89 EXIT 13, Chittenden, VT

Built 1962 Load: 49.9 t ADT: 36,800

C3029

Good

Over: COBB BROOK

0.2 MI TO JCT W CL2 TH1, Chittenden, VT

Built 1914 Load: 50.8 t ADT: 10

I 00089 ML

Good

Over: MUDDY BROOK

1.0 MI N EXIT 12, Chittenden, VT

Built 1963 Load: 50.8 t ADT: 41,000

I 00089 ML

Good

Over: MUDDY BROOK

1.0 MI N EXIT 12, Chittenden, VT

Built 1963 Load: 50.8 t ADT: 41,000

C3031

Good

Over: HUNTINGTON RIVER

0.01 MI TO JCT W CL2 TH1, Chittenden, VT

Built 1963 Load: 51.7 t ADT: 50

C2004

Good

Over: ROGERS BROOK

0.1 MI N OF JCT TH 1+TH 4, Chittenden, VT

Built 2005 Load: 51.7 t ADT: 370

TR 00TH3

Good

Over: TH NO 3 OVER I 89

0.8 MI N EXIT 12, Chittenden, VT

Built 1963 Load: 51.7 t ADT: 250

C3006

Good

Over: ALLEN BROOK

1.0 MI TO JCT W VT2A, Chittenden, VT

Built 1996 Load: 52.6 t ADT: 810

VT 00015 ML

Good

Over: BROWNS RIVER

2.1 MI E JCT. VT.128, Chittenden, VT

Built 1968 Load: 52.6 t ADT: 10,100

TR 01 FAS 211

Good

Over: BRUSH BROOK

6.5 MI N JCT VT.17, Chittenden, VT

Built 1976 Load: 52.6 t ADT: 1,700

I 00089 ML

Good

Over: I 89 OVER TH NO 8

0.6 MI N EXIT 11, Chittenden, VT

Built 1962 Load: 53.5 t ADT: 36,300

I 00089 ML

Good

Over: I 89 OVER TH NO 8

0.6 MI N EXIT 11, Chittenden, VT

Built 1962 Load: 53.5 t ADT: 36,300

US 00002 ML

Good

Over: I 89 UNDER US 2

1.1 MI E JCT. U.S.7 S, Chittenden, VT

Built 1962 Load: 53.5 t ADT: 33,300

LIME KILN RD TH4

Good

Over: WINOOSKI RIVER & NECRR

0.2 MI S JCT VT 15 ON TH4, Chittenden, VT

Built 2006 Load: 53.5 t ADT: 7,300

TR 02 FALLS ROAD

Good

Over: LAPLATTE RIVER

1.2 MI E JCT. U.S.7, Chittenden, VT

Built 1988 Load: 55.3 t ADT: 5,400

I 00089 ML

Good

Over: WINOOSKI RIVER

1.3 MI N EXIT 14, Chittenden, VT

Built 1962 Load: 57.2 t ADT: 56,400

I 00089 ML

Good

Over: WINOOSKI RIVER

1.3 MI N EXIT 14, Chittenden, VT

Built 1962 Load: 57.2 t ADT: 56,400

C3028

Good

Over: HUNTINGTON RIVER

0.01 MI TO JCT W CL2 TH1, Chittenden, VT

Built 1977 Load: 60.8 t ADT: 300

C2003

Good

Over: VERMONT RAILWAY

1.0 MI TO JCT W US7, Chittenden, VT

Built 2004 Load: 61.7 t ADT: 2,300

VT 00289 RAMP A

Good

Over: RAMP A OVER NEC RR

0.1 MI E JCT. VT. 2A, Chittenden, VT

Built 1993 Load: 62.6 t ADT: 16,600

TR 01 FAS 233

Good

Over: BROWNS RIVER

2.6 MI E JCT. VT.15, Chittenden, VT

Built 2001 Load: 63.5 t ADT: 3,200

VT 00015 ML

Good

Over: BROWNS RIVER

6.0 MI E JCT. VT.128, Chittenden, VT

Built 1982 Load: 64.4 t ADT: 11,200

C3033

Good

Over: MILL BROOK

0.1 MI TO JCT W CL2 TH4, Chittenden, VT

Built 1992 Load: 65.3 t ADT: 138

VT 00289 RAMP D

Good

Over: RAMP D OVER NEC RR

0.1 MI E JCT. VT. 2A, Chittenden, VT

Built 1993 Load: 65.3 t ADT: 16,600

VT 00117 ML

Good

Over: MILL BROOK

5.8 MI E JCT. VT.15&2A, Chittenden, VT

Built 1979 Load: 65.3 t ADT: 4,900

US 00002 ML

Good

Over: US 2 OVER NECRR

0.1 MI W JCT VT.117, Chittenden, VT

Built 1938 Load: 68.0 t ADT: 3,200

TR 01 FAS 233

Good

Over: SEYMOUR BROOK

5.3 MI S JCT. VT.108, Chittenden, VT

Built 1992 Load: 68.9 t ADT: 1,000

N. WILLISTON ROAD

Good

Over: WINOOSKI RIVER

0.34 MI TO JCT W VT117, Chittenden, VT

Built 1993 Load: 69.9 t ADT: 5,400

VT 00015 ML

Good

Over: VT 15 OVER VT 289

1.5 MI E JCT. VT. 2A, Chittenden, VT

Built 1993 Load: 82.6 t ADT: 20,600

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.